The difference between Octothorpe and Pound sign
When used as nouns, octothorpe means the hash or square symbol (), used mainly in telephony and computing, whereas pound sign means the symbol £ representing the pound sterling.
check bellow for the other definitions of Octothorpe and Pound sign
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Octothorpe as a noun (chiefly, US, typography):
The hash or square symbol (), used mainly in telephony and computing.
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Pound sign as a noun:
The symbol £ representing the pound sterling
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Pound sign as a noun (US):
The symbol on a telephone
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Pound sign as a noun (US):
The symbol denoting weight in pounds
Examples:
"A bag of peanuts is marked "5<sup>#</sup>"."